Inspect, Investigate
If a tree is growing out of a top hat you need to inspect it to find out why and how this happened. You should probably investigate the area too. I mean, how could a tree grow out of a top hat anyway? Seems suspicious.
Inspect the tree. Inspect the top hat. Did you find anything?
さ
None
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While inspecting, you realize you need to saw (さ) the tree open to come to a good conclusion. This seems a bit unnecessary, but no! No! For the sake of this investigation you must saw the tree in half!
Imagine stopping to inspect the tree after each minute of sawing. You'll find out why it's growing out of a top hat! Eventually!